The financial crisis has made the I.M.F.

VOA: special.2009.04.24

B.F. Skinner never let his pigeons starve; they all made it out alright.

.F.斯金纳从不让他的鸽子挨饿,所以它们都活得挺好

耶鲁公开课 - 金融市场课程节选